Granatelli Dual 4" Electric Exhaust Cutout Kit, Mild Steel Slip-Fit – 303540D

Granatelli Motor Sports Electronic Exhaust Cutout Kit – 4.0" Dual System

SKU: 303540D

Unleash your vehicle’s full potential with the Granatelli Motor Sports 303540D Electronic Exhaust Cutout Kit. Designed for performance enthusiasts, this dual-system slip-fit kit offers effortless control over your exhaust flow, allowing you to switch between a subtle, quiet tone and an aggressive, throatier roar at the touch of a button.

Key Features:

• Slip-Fit Design: Engineered for easy installation with a 4.0" (102mm) slip-fit connection, making integration into your exhaust system straightforward and secure.

• Mild Steel Construction: Crafted from durable aluminized mild steel to provide excellent corrosion resistance while maintaining a cost-effective price point.

• Precision Engineering: CNC-machined 6061 aircraft-grade aluminum housing ensures lightweight strength and longevity.

• High-Performance Components: Stainless steel butterfly plates and blade shafts resist corrosion and wear for reliable operation.

• Advanced Control Mechanism: Smart chip-controlled motors with one-touch rocker switch allow smooth, damage-free operation without the need to hold the switch.

• Robust Motor Design: High-torque DC gear-reduction motors provide consistent, powerful open/close action.

• Heat-Resistant Gears: Drive gears crafted from high-temperature carbon steel to withstand extreme conditions.

• Complete Installation Kit: Includes mounting hardware, gaskets, wiring harnesses, and polished stainless steel 45-degree slanted turndowns for optimal exhaust flow.

• Universal Fitment: Fits most vehicles with a 4.0" exhaust diameter; minor modifications may be required.

Performance Benefits:

• Enhanced Throttle Response & Power: Reduce backpressure and improve engine breathing for quicker acceleration and noticeable torque gains.

• Sound Customization: Easily switch from a quiet, everyday driving sound to a bold, aggressive exhaust note that turns heads wherever you go.

• Effortless Control: Operate your exhaust cutouts with a simple flip of a switch, giving you ultimate control over your vehicle’s performance and sound.

Specifications

Ready to transform your ride? The Granatelli Motor Sports Electronic Exhaust Cutout Kit 303540D delivers unbeatable performance, unmatched sound control, and durable construction—all wrapped up in a convenient slip-fit design. Whether you’re craving stealthy cruising or an aggressive growl, this kit gives you the power to command your exhaust with precision and style. Don’t settle for ordinary—upgrade your exhaust system and experience driving excitement like never before!

Sizing & Fitment

Measure the outside diameter of your exhaust pipe at the mounting point. If it measures 4", this kit is the right match. This dual kit is for true dual exhaust systems, one cutout per side. Single exhaust? Choose the single 303540 kit. Want a permanent, leak-free install? See the 307540K weld-in version. Daily driver in a wet or salted-road climate? Consider the stainless steel 302540K.

Where to Mount It

Mount the cutout at least 18" from the cylinder head and any O2 sensor, and always after the catalytic converters. Aim the turndown toward the rocker panel, away from fuel and brake lines. For the best sound, mount it after the X-pipe or H-pipe.

Legal Note

Many states, including California, prohibit exhaust cutouts on vehicles driven on public roads. Keep the cutout closed on the street and open it only at sanctioned off-highway events. Never install a cutout upstream of a catalytic converter.

Frequently Asked Questions

Do I have to hold the switch?
No. The Smart-Chip one-touch rocker completes the valve's travel with one tap.

Can I install it myself?
Yes. This kit clamps onto the pipe, so most installs need only basic hand tools and a way to cut the pipe.

What's the warranty?
90 days, with optional 1-, 2- or 3-year extended coverage available at checkout.

Will it add horsepower?
Opening the cutout reduces backpressure. Gains depend on your engine, headers and tune.

New to cutouts? Read our 4 Inch Exhaust Cutout Guide for choosing the right size and type, mounting and state laws.